Probably the smiley in the top question is covering 48? if it is the answer is,
multiply the outsides by 2 and take away the left from the right.
17x2=34.....50x2=100.......100-34=66
20x2=40.....44x2=88.........88-40=48
35x2=70.....60x2=120.......120-70=50
Hope this helps.
Good luck

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